Finding ID | Version | Rule ID | IA Controls | Severity |
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V-221864 | OL07-00-040470 | SV-221864r880591_rule | Medium |
Description |
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If compression is allowed in an SSH connection prior to authentication, vulnerabilities in the compression software could result in compromise of the system from an unauthenticated connection, potentially with root privileges. |
STIG | Date |
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Oracle Linux 7 Security Technical Implementation Guide | 2023-03-06 |
Check Text ( C-23579r880589_chk ) |
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Note: For Oracle Linux 7.4 and above, this requirement is not applicable. Verify the SSH daemon performs compression after a user successfully authenticates. Check that the SSH daemon performs compression after a user successfully authenticates with the following command: # grep -i compression /etc/ssh/sshd_config Compression delayed If the "Compression" keyword is set to "yes", is missing, or the returned line is commented out, this is a finding. |
Fix Text (F-23568r880590_fix) |
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Uncomment the "Compression" keyword in "/etc/ssh/sshd_config" (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor) on the system and set the value to "delayed" or "no": Compression no The SSH service must be restarted for changes to take effect. |